AT89LP428 datasheet(28/149 Pages) ATMEL

部件名	AT89LP428

功能描述	8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash

PDF	149 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

标志

28 / 149 page

3654A–MICRO–8/09

AT89LP428/828

Figure 8-2.

Interrupt Recovery from Power-down (PWDEX = 1)

8.2.2

Reset Recovery from Power-down

The wake-up from Power-down through an external reset is similar to the interrupt with

PWDEX = “0”. At the falling edge of RST, Power-down is exited, the oscillator is restarted, and

an internal timer begins counting as shown in Figure 8-3. The internal clock will not be allowed to

propagate to the CPU until after the timer has timed out. The time-out period is controlled by the

Start-up Timer Fuses. (See Table 7-1 on page 25). If RST returns high before the time-out, a two

clock cycle internal reset is generated when the internal clock restarts. Otherwise, the device will

remain in reset until RST is brought high.

Figure 8-3.

Reset Recovery from Power-down

PWD

INT1

XTAL1

Internal

Clock

PWD

RST

XTAL1

tSUT

Internal

Clock

Internal

Reset

AT89LP428 数据表(PDF) 28 Page - ATMEL Corporation